Road roller



ROAD ROLLER Filed Feb. 19, 1938 4 Shects Sheet 1 INVENTOR PETER LZETTELMEYER 7 BY HIS ATTORNEYS R ZETTELMEYYER 0 3 Q ROAD ROLLER Filed Feb. 19, 1958 4 Sheets-Sheet 2 PETE-R v ZETTELMEY'ER' BY HIS ATTORNEYS Feb. 4, 194l.' P. ZETTELMEYER 2,230,317

ROAD ROLLER Filed Feb.'19, 1958 4 Sheets-Sheet 3 INVENTOR PETER ZETTELMEYER BY HIS ATTORNEYS P: ZETTELMEY'ER I v2,250,317

I I IINVENTOR PETER ZETTELMEYER J BY HIS ATTORNEYS Patented Feb. 4, 941 h I 2,230,317

,UNITED STATES PATENT OFFICE Application February-19, 1938, Serial No. 191,552 In Germany February 23, 1937 12 Claims. (Cl. 94-50) This invention relates to a road roller with ad- The practical construction is such that for the justable rolling wheels or rolls. In order to enroll a casing is employed, which is pivotally conable the rolls of road rollers to be adjusted to the nected by a joint, such as a bolt, with the frame profile of a road, it is known to make the rolls of the road-roller, and at the same time receives '0 adjustable. This adjustability brings with it a the ring of teeth and the driving pinion of'the number of diflicuities. Thus for example the roll. This arrangement at the same time brings driving of'the rolls, which is normally effected by with it the great advantage that the pinion and of toothed wheels, becomes inconvenient, the ring of teeth are both enclosed. Hence no because the driving engine is arranged upon the foreign bodies, such as sandfor example, can

l0 vehicle frame, and the rolls are in an inclined enter the toothed gearing. With this construcposition in relation to this frame. In many contion the toothed pinion and the ring of teeth structions this has simply been compensated for accompany the rocking movement ofthe roll. within the toothed drive, that is to say, the pinion A further feature of .the invention therefore 1 meshing with the teethon the roll is mounted consists in the equalization in the drive being 10- fast on the frame of the road roller, and when cated inside the frame of the road roller. In this 15 the position is inclined, the twov toothed wheels way are also obviated those disadvantages that also take up an inclined position. For clean occur in those rollers in which the equalization working of the toothed gearing such an arrangein the drive is effected in the toothed gearing, that meat is unsatisfactory. is to say, between the pinion and the ring of It is further desirable that the rolls should adteeth. In consequence of the adoption of a cas- 20 just themselves automatically in order that'they ing for the rolls there is a simple possibility of may follow any changes in the profile of the arranging a fixing'appliance which is attached road. If the axle of the rolls is arranged in the directly to the casing. usual manner as to be oscillatable about a point, The invention is illustrated by way of examp l5 springs must be provided, which impart an inin the accompanying drawings, in which itial-stress to the axles, so that the rear wheels, Figure 1 is a side elevation view partly .in secequipped with springs in this manner, feel or tion through a road roller, embodying the inven- I test the profile of the road. The springs bring tion.

, with them an undesirable complication of the Figure 2 is a transverse section view through road roller, and the custom has therefore been the roller of Figure l. 30

p ed of arranging therolls upon the axle by Figure 3 is a detail view showing in cross secthe aid of a ball-and-socket joint. Such a ball tion the drive for the rolls. I bearing is however expensive to manufacture. Figure 4 is a detail view, similar to Figure 3,

Furthermore all the structures hitherto menof a modified construction.

. tioned also have the disadvantage that in the ad- Figure 5 is a plan view of the rear portion of 35 lusting of the roll the tire travels sideways to a the roller with the drive mechanism. marked extent upon the road surface, which is The roadroller comprises a frame I which undesirable. in the front portion is bent upwardly for mount- According to the present invention the rolls ing the front roll 2. The lower portion of the 40 are pivoted to the frame of the road roller at a frame consists of longitudinalgirders 3 and sev- 0 place located underneath the axle and within the eral transverse beams 4. The steering of the breadth of the tire.' The fundamental idea of front roll 2 is effected by means of the handle 5, this suggestion consists in locating the point of which controls the steering (not shown in detail) rotation for the rolls at a lower level than in the by way of a shaft 6.

structures hitherto known, since by this means In the rear portion of the roller is disposed the 45 on the one hand in consequence of the intrinsic driving motor 1, driving by way of a gearing 8 the weight of the road'roller as a whole a good autodriving shaft 9, on the end of which a small matic adjustment of the rolls is effected, and on bevel pinion I0 is mounted, meshing with a large .the' other hand the transverse movement of the bevelled toothed wheel ii. The latter is mounted so tire upon the road surface becomes less, so that on a shaft l2, driving the rear rolls l3 and I4 the disadvantages occurring owing to the travel in the manner described hereinafter. The rolls in the transverse direction are practically prel3 and H are linked to the girders. v For this pur- .c1uded. The transverse rocking of the tire in pose two transverse beams i5 similar to the the-upper half of the wheel is greater, but this beams 4 are bolted to the frame (Fig. 2). For

an: nowonsequence. mounting the rolls l3, N the beams ii are prok i I I I- vided with laterally projecting bearing eyes l6. For each roll |3, |4 a'casing I1 is provided, in which the roll is journalled. The supporting is efiected by means of an angle l8 and ball bearings l9 and 20. To the casing I1 is bolted in the lower portion a bearing plate 2|. This plate has two webs 22 and 23 welded on to it, one at each end, between which the bearing eyes |6.0f the frame engage. Joint bolts 24, which are secured in the usual manner by screws or the like, serve to complete the joint.

Inside the casing H a large toothed wheel 25 is keyed to the shaft Hi. In the teeth of this wheel meshes a pinion 26, as shown in Figure 3,

this pinion likewise being located inside the casing preferably, as shown in Figures. 1 and 2,

' at the height of the axle I8 of the roll, and in front of (or even behind) the axle, as seen in the direction of travel. This pinion 26 is cut directly upon a hollow shaft 21, which is supported with ball bearings 28' in the casing i1 and in a lateral extension 29 thereof. Beside the casing I1, 29, is located a brake 30,which is only diagrammaticallyindicated. The hollow shaft is internally grooved, and a grooved shaft 3| engages slidably therein, this latter shaft being driven by driving shaft I2 of the road roller through the medium of a double joint 32.

The method of working of the rolls, supported and driven in the manner already described, is

as follows. If the rolls come on to a rounded or inclined road profile, the casing H, with the rolls, swings about the bolts 24. which this tilting movement takes place is located below the axle l8 of the rolls, and in fact as low down as possible, about in the lower vhalf of the radius of the roll, since the 'lower down this axis is located, the easier is automatic adjustment. In consequence of the low tilting axis only a'very slight travels. upon the road surface for a given obliquity of the rolls occurs, whereas if the tilting axis were located at the axis l8 of the rolls, a travel T would be produced with, the same obliquity. It isfurthermore under some circumstance desirable to arrange the tilting axis, as emphasized in Figure '2, not in a rounded profile to a fiat profile, is facilitated,-

- whole.

the centre of the breadth of the tire but somewhat towards the middle of the road N By this. means the returning of the rolls, which takes place at the transitions from since the torque. in consequence of the greater breadth of the tire,"looking outwards from the tiltingaxis, is higher.

The toothed wheels 25 and 26 are completely.

enclosed in the casing l'l, so they are protected against dirt, and can be very. carefully lubricated. Moreover by employing a low pitch, a

' good supporting and a comparatively high trans- In order to enable the rolls, which can ad-. just themselves automatically to the road profile and to the irregularities of the road, to be secured in any desired position, a fastening ap-- pliance' is attached to'the caslng ll. To the casing an eye 33 is connected by means of a The axis about 'roller as a i bolt 34 with a threaded spindle 35. Upon this spindle hand wheels 36 and 31 are mounted to left and right respectively. Between the hand wheels and the fixed wall 38 of the frame. are provided springs 39. These springs serve to 5 minimize the shocks, 'when the stroke is fully utilized. In order to obtain a limitation of are both rotated on the threads of the spindle towards one another so far that the stroke 16 movement is eliminated in the case of both rolls and the sleeve is pressed against the fixed wall. If adjustability within certain limits is desired for the roll, the hand wheels are rotated so far that the stroke between sleeve and hand wheel is of the desired amount. To avoid shocks in these positions also, the spring is operative as a resilient intermediate member. The adjustment mayv be effected either uniformly for both wheels or differently for .each wheel.

While maintaining the described pivoting of the rolls at a position below the roll-axis, it is possible to employ a sort of parallelogram guide for the purpose of obtaining a parallel or almost parallel displacement of the rolls. For this pur- 3 pose, as Figure 4 shows, the rolls are g'uidedin the upper portion and in the lower portion by links 4| and 42 respectively, of which the upper one is attached to the locking appliance already described, and the lower one to the roll or to a 35 A further possibility with this construction 5 consists in making the links 4| and 42 unequal in length, so that withina certain range a uniformtrace is ensured, that is to say, in the event of an alteration in the set or inclination of the rolls, or in other'words in the adjustability 50 thereof, there is no narrowing or widening of. the trace or wheeltrack.

In this form of construction the adjusting appliance works in the same manner as that previously described. If the upper link is dis- 55 placed outwards or inwards by the adjusting appliance, the obliquity of the roll changes. A springing of the frame is in this case effected by the spring 44, so that the frame, with the gear, is protected against shocks as in other 9 vehicles. When the suspension springs are deflected the rolls move parallel or approximately parallel, and with the adjustingappliance loose, the adjusting of the wheels also takes place to correspond to the road profile. Holes and irregularities occurring in the road surface are also," ascertained and rolled in owing to the transverse adjustability.

Many modifications within the scope of my invention will occur to those skilled in the art; 70 therefore, I do not limit the invention, to the specific forms illustrated in the drawings.

What I claim is:

1. A road roller, comprising a frame, adjustable. rolls, means rotatably supporting said rolls and having axes extending transversely of said transversely extending axes of rotation of theroll and within the breadth of the roll, a casing in which the roll issupported, a joint con-.

necting the said casing with the frame, a wall element rigidly secured to the frame, means mounted on the upper part of the casing for adjusting the inclination of the roll and securing it at its adjusted inclination, the said adjusting means comprising a screw-threaded spindle extending through the said wall element, two internally screw-threaded hand wheels mounted on the spindle, one on each side of the wall element, and two springs coiled round the spindle, each'in'terposed between the wall element and one of the hand wheels. 2. A road roller, comprising a able rolls, means rotatably supporting said rolls and having axes extending transversely of said roller, means pivotally connecting said rolls to the frame so that said rolls may tilt, the axes 'of said pivotal means extending lengthwise of said roller and being below said transversely extending axes of rotation of said rolls, and within the breadth of said rolls.

3. A road roller, comprising a frame, adjustable rolls, means rotatably supporting said rolls and having axes extending transversely of said roller, means pivotally connecting the rolls to the frame so that said rolls may tilt, the axes able rolls, a toothed wheel rigidly connected of said pivotal means extending lengthwise of said roller. and being below said transversely extending axes of rotation of the roll adistance atleast one-half the radius of the rolls and within frame, adjustthat half of the breadthof the rolls which is I nearer to the center line of the vehicle.

4. A road roller, comprising a frame, adjustable rolls, a casing for supporting each roll, a pivotal joint connecting each casing to the ,frame so that the rolls may be tilted, the axes of said joints being below the axes of rotation of said rolls and within the breadth of said rolls.

5. A road roller, comprising a frame, adjustwith each roll, toothed driving pinions meshing with the toothed wheels, a casing enclosing each toothed wheel and supporting each'roll, a joint pivotally connecting each casing with the frame so that the rolls may be tilted, the axes of'zsaid joints being below the axes of rotation of said rolls and within the breadth of said rolls.

. means 6.'A road roller, comprising a frame, adjustable rolls, means rotatably supporting said rolls and having axes extending transversely of said rollenmeans pivotally connecting said rolls to the frame so that the rolls may tilt, the axis of said pivotal meansextending lengthwise of said roller and being below' said transversely tion.

'means includes upper each roll, toothed driving pinions meshing with the toothed wheels, a hollow shaft carrying the toothed pinion, a grooved shaft longitudinally slidable within said hollow shaft, an engine carried by and driving the road roller, and a double joint connecting the grooved: shaft with the engine, and means pivotally connecting said rolls to the frame so that the rolls may tilt, the axes of said pivotal means being below the axes of rotation of said rolls and within the breadth of said rolls.

8. A road roller, comprising a frame, adjustable rolls, a casing for supporting each roll, a pivotal joint connectingeach casing to the frame so that the rolls may be tilted, the axes of: said joints being below the axes of rotation of saidrolls and within the breadth of said rolls, and means mounted on the upper part of each casing for adiusting the inclination of the roll it supports and securing .it at its adjusted inclina- 9. A road roller, comprising a frame, adjustable rolls, a casing for supporting each roll, a pivotal joint connecting each casing to the frame so that the rolls may be tilted, the axes of said joints being below the axes of rotation of said rolls and within the breadth of said rolls, and means mounted on the upper part of each casing for adjusting the inclinations of the rolls independently of one another and securing them at their respective adjused inclinations.

, 10. A road roller, comprising a frame,.adjustable rolls, a casing for supporting eacli roll, a

pivotal joint connecting, each casin to the frame so that the rolls may be tilted, the axes of said jointsbeing below the axes of rotation of said rolls and within-the breadth or said rolls, and means mounted on the upper part of each casing for adjusting the inclination of the roll it supports and securing it at its adjusted inclination, and means foradjusting the amplitude of movement of said roll-inclination-adjusting 1-1. A road roller as claimed inlclaim 2, fur- 1 ther characterized in that the pivotal connecting means includes upper and lower parallel links providing a parallel guide means for said rolls. 1,2. A 'roadroller as claimed in claim 2, further characterized in that the pivotal connecting and lower parallel links providi g .a parallel guide means forsaid rolls, and spring means interposed between the roll and theframe. e

PETER 

